Commit | Line | Data |
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3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
b0069f43 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
52e5c1ce | 21 | * |
3e7ee490 | 22 | */ |
0a46618d HJ |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
3e7ee490 HJ |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
3e7ee490 HJ |
28 | #include <linux/interrupt.h> |
29 | #include <linux/sysctl.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
b0069f43 | 31 | #include <linux/acpi.h> |
8b5d6d3b | 32 | #include <linux/completion.h> |
46a97191 | 33 | #include <linux/hyperv.h> |
b0209501 | 34 | #include <linux/kernel_stat.h> |
4061ed9e | 35 | #include <linux/clockchips.h> |
e513229b | 36 | #include <linux/cpu.h> |
407dd164 | 37 | #include <asm/hyperv.h> |
1f94ea81 | 38 | #include <asm/hypervisor.h> |
302a3c0f | 39 | #include <asm/mshyperv.h> |
96c1d058 NM |
40 | #include <linux/notifier.h> |
41 | #include <linux/ptrace.h> | |
35464483 | 42 | #include <linux/screen_info.h> |
510f7aef | 43 | #include <linux/kdebug.h> |
0f2a6619 | 44 | #include "hyperv_vmbus.h" |
3e7ee490 | 45 | |
607c1a11 | 46 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 47 | |
59c0e4f0 | 48 | static struct tasklet_struct msg_dpc; |
71a6655d | 49 | static struct completion probe_event; |
98db4335 | 50 | |
96c1d058 | 51 | |
510f7aef | 52 | static void hyperv_report_panic(struct pt_regs *regs) |
96c1d058 | 53 | { |
510f7aef | 54 | static bool panic_reported; |
96c1d058 | 55 | |
510f7aef VK |
56 | /* |
57 | * We prefer to report panic on 'die' chain as we have proper | |
58 | * registers to report, but if we miss it (e.g. on BUG()) we need | |
59 | * to report it on 'panic'. | |
60 | */ | |
61 | if (panic_reported) | |
62 | return; | |
63 | panic_reported = true; | |
96c1d058 NM |
64 | |
65 | wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip); | |
66 | wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax); | |
67 | wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx); | |
68 | wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx); | |
69 | wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx); | |
70 | ||
71 | /* | |
72 | * Let Hyper-V know there is crash data available | |
73 | */ | |
74 | wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY); | |
510f7aef VK |
75 | } |
76 | ||
77 | static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, | |
78 | void *args) | |
79 | { | |
80 | struct pt_regs *regs; | |
81 | ||
82 | regs = current_pt_regs(); | |
83 | ||
84 | hyperv_report_panic(regs); | |
96c1d058 NM |
85 | return NOTIFY_DONE; |
86 | } | |
87 | ||
510f7aef VK |
88 | static int hyperv_die_event(struct notifier_block *nb, unsigned long val, |
89 | void *args) | |
90 | { | |
91 | struct die_args *die = (struct die_args *)args; | |
92 | struct pt_regs *regs = die->regs; | |
93 | ||
94 | hyperv_report_panic(regs); | |
95 | return NOTIFY_DONE; | |
96 | } | |
97 | ||
98 | static struct notifier_block hyperv_die_block = { | |
99 | .notifier_call = hyperv_die_event, | |
100 | }; | |
96c1d058 NM |
101 | static struct notifier_block hyperv_panic_block = { |
102 | .notifier_call = hyperv_panic_event, | |
103 | }; | |
104 | ||
7f163a6f | 105 | struct resource *hyperv_mmio; |
98db4335 | 106 | |
cf6a2eac S |
107 | static int vmbus_exists(void) |
108 | { | |
109 | if (hv_acpi_dev == NULL) | |
110 | return -ENODEV; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
fd776ba9 OH |
115 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
116 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
117 | { | |
118 | int i; | |
119 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
120 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
121 | } | |
122 | ||
76c52bbe GKH |
123 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
124 | { | |
125 | return (u8)channel->offermsg.monitorid / 32; | |
126 | } | |
127 | ||
128 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
129 | { | |
130 | return (u8)channel->offermsg.monitorid % 32; | |
131 | } | |
132 | ||
133 | static u32 channel_pending(struct vmbus_channel *channel, | |
134 | struct hv_monitor_page *monitor_page) | |
135 | { | |
136 | u8 monitor_group = channel_monitor_group(channel); | |
137 | return monitor_page->trigger_group[monitor_group].pending; | |
138 | } | |
139 | ||
1cee272b GKH |
140 | static u32 channel_latency(struct vmbus_channel *channel, |
141 | struct hv_monitor_page *monitor_page) | |
142 | { | |
143 | u8 monitor_group = channel_monitor_group(channel); | |
144 | u8 monitor_offset = channel_monitor_offset(channel); | |
145 | return monitor_page->latency[monitor_group][monitor_offset]; | |
146 | } | |
147 | ||
4947c745 GKH |
148 | static u32 channel_conn_id(struct vmbus_channel *channel, |
149 | struct hv_monitor_page *monitor_page) | |
150 | { | |
151 | u8 monitor_group = channel_monitor_group(channel); | |
152 | u8 monitor_offset = channel_monitor_offset(channel); | |
153 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
154 | } | |
155 | ||
03f3a910 GKH |
156 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
157 | char *buf) | |
158 | { | |
159 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
160 | ||
161 | if (!hv_dev->channel) | |
162 | return -ENODEV; | |
163 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
164 | } | |
165 | static DEVICE_ATTR_RO(id); | |
166 | ||
a8fb5f3d GKH |
167 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
168 | char *buf) | |
169 | { | |
170 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
171 | ||
172 | if (!hv_dev->channel) | |
173 | return -ENODEV; | |
174 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
175 | } | |
176 | static DEVICE_ATTR_RO(state); | |
177 | ||
5ffd00e2 GKH |
178 | static ssize_t monitor_id_show(struct device *dev, |
179 | struct device_attribute *dev_attr, char *buf) | |
180 | { | |
181 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
182 | ||
183 | if (!hv_dev->channel) | |
184 | return -ENODEV; | |
185 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
186 | } | |
187 | static DEVICE_ATTR_RO(monitor_id); | |
188 | ||
68234c04 GKH |
189 | static ssize_t class_id_show(struct device *dev, |
190 | struct device_attribute *dev_attr, char *buf) | |
191 | { | |
192 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
193 | ||
194 | if (!hv_dev->channel) | |
195 | return -ENODEV; | |
196 | return sprintf(buf, "{%pUl}\n", | |
197 | hv_dev->channel->offermsg.offer.if_type.b); | |
198 | } | |
199 | static DEVICE_ATTR_RO(class_id); | |
200 | ||
7c55e1d0 GKH |
201 | static ssize_t device_id_show(struct device *dev, |
202 | struct device_attribute *dev_attr, char *buf) | |
203 | { | |
204 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
205 | ||
206 | if (!hv_dev->channel) | |
207 | return -ENODEV; | |
208 | return sprintf(buf, "{%pUl}\n", | |
209 | hv_dev->channel->offermsg.offer.if_instance.b); | |
210 | } | |
211 | static DEVICE_ATTR_RO(device_id); | |
212 | ||
647fa371 GKH |
213 | static ssize_t modalias_show(struct device *dev, |
214 | struct device_attribute *dev_attr, char *buf) | |
215 | { | |
216 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
217 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
218 | ||
219 | print_alias_name(hv_dev, alias_name); | |
220 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
221 | } | |
222 | static DEVICE_ATTR_RO(modalias); | |
223 | ||
76c52bbe GKH |
224 | static ssize_t server_monitor_pending_show(struct device *dev, |
225 | struct device_attribute *dev_attr, | |
226 | char *buf) | |
227 | { | |
228 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
229 | ||
230 | if (!hv_dev->channel) | |
231 | return -ENODEV; | |
232 | return sprintf(buf, "%d\n", | |
233 | channel_pending(hv_dev->channel, | |
234 | vmbus_connection.monitor_pages[1])); | |
235 | } | |
236 | static DEVICE_ATTR_RO(server_monitor_pending); | |
237 | ||
238 | static ssize_t client_monitor_pending_show(struct device *dev, | |
239 | struct device_attribute *dev_attr, | |
240 | char *buf) | |
241 | { | |
242 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
243 | ||
244 | if (!hv_dev->channel) | |
245 | return -ENODEV; | |
246 | return sprintf(buf, "%d\n", | |
247 | channel_pending(hv_dev->channel, | |
248 | vmbus_connection.monitor_pages[1])); | |
249 | } | |
250 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 251 | |
1cee272b GKH |
252 | static ssize_t server_monitor_latency_show(struct device *dev, |
253 | struct device_attribute *dev_attr, | |
254 | char *buf) | |
255 | { | |
256 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
257 | ||
258 | if (!hv_dev->channel) | |
259 | return -ENODEV; | |
260 | return sprintf(buf, "%d\n", | |
261 | channel_latency(hv_dev->channel, | |
262 | vmbus_connection.monitor_pages[0])); | |
263 | } | |
264 | static DEVICE_ATTR_RO(server_monitor_latency); | |
265 | ||
266 | static ssize_t client_monitor_latency_show(struct device *dev, | |
267 | struct device_attribute *dev_attr, | |
268 | char *buf) | |
269 | { | |
270 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
271 | ||
272 | if (!hv_dev->channel) | |
273 | return -ENODEV; | |
274 | return sprintf(buf, "%d\n", | |
275 | channel_latency(hv_dev->channel, | |
276 | vmbus_connection.monitor_pages[1])); | |
277 | } | |
278 | static DEVICE_ATTR_RO(client_monitor_latency); | |
279 | ||
4947c745 GKH |
280 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
281 | struct device_attribute *dev_attr, | |
282 | char *buf) | |
283 | { | |
284 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
285 | ||
286 | if (!hv_dev->channel) | |
287 | return -ENODEV; | |
288 | return sprintf(buf, "%d\n", | |
289 | channel_conn_id(hv_dev->channel, | |
290 | vmbus_connection.monitor_pages[0])); | |
291 | } | |
292 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
293 | ||
294 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
295 | struct device_attribute *dev_attr, | |
296 | char *buf) | |
297 | { | |
298 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
299 | ||
300 | if (!hv_dev->channel) | |
301 | return -ENODEV; | |
302 | return sprintf(buf, "%d\n", | |
303 | channel_conn_id(hv_dev->channel, | |
304 | vmbus_connection.monitor_pages[1])); | |
305 | } | |
306 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
307 | ||
98f4c651 GKH |
308 | static ssize_t out_intr_mask_show(struct device *dev, |
309 | struct device_attribute *dev_attr, char *buf) | |
310 | { | |
311 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
312 | struct hv_ring_buffer_debug_info outbound; | |
313 | ||
314 | if (!hv_dev->channel) | |
315 | return -ENODEV; | |
316 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
317 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
318 | } | |
319 | static DEVICE_ATTR_RO(out_intr_mask); | |
320 | ||
321 | static ssize_t out_read_index_show(struct device *dev, | |
322 | struct device_attribute *dev_attr, char *buf) | |
323 | { | |
324 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
325 | struct hv_ring_buffer_debug_info outbound; | |
326 | ||
327 | if (!hv_dev->channel) | |
328 | return -ENODEV; | |
329 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
330 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
331 | } | |
332 | static DEVICE_ATTR_RO(out_read_index); | |
333 | ||
334 | static ssize_t out_write_index_show(struct device *dev, | |
335 | struct device_attribute *dev_attr, | |
336 | char *buf) | |
337 | { | |
338 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
339 | struct hv_ring_buffer_debug_info outbound; | |
340 | ||
341 | if (!hv_dev->channel) | |
342 | return -ENODEV; | |
343 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
344 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
345 | } | |
346 | static DEVICE_ATTR_RO(out_write_index); | |
347 | ||
348 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
349 | struct device_attribute *dev_attr, | |
350 | char *buf) | |
351 | { | |
352 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
353 | struct hv_ring_buffer_debug_info outbound; | |
354 | ||
355 | if (!hv_dev->channel) | |
356 | return -ENODEV; | |
357 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
358 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
359 | } | |
360 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
361 | ||
362 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
363 | struct device_attribute *dev_attr, | |
364 | char *buf) | |
365 | { | |
366 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
367 | struct hv_ring_buffer_debug_info outbound; | |
368 | ||
369 | if (!hv_dev->channel) | |
370 | return -ENODEV; | |
371 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
372 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
373 | } | |
374 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
375 | ||
376 | static ssize_t in_intr_mask_show(struct device *dev, | |
377 | struct device_attribute *dev_attr, char *buf) | |
378 | { | |
379 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
380 | struct hv_ring_buffer_debug_info inbound; | |
381 | ||
382 | if (!hv_dev->channel) | |
383 | return -ENODEV; | |
384 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
385 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
386 | } | |
387 | static DEVICE_ATTR_RO(in_intr_mask); | |
388 | ||
389 | static ssize_t in_read_index_show(struct device *dev, | |
390 | struct device_attribute *dev_attr, char *buf) | |
391 | { | |
392 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
393 | struct hv_ring_buffer_debug_info inbound; | |
394 | ||
395 | if (!hv_dev->channel) | |
396 | return -ENODEV; | |
397 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
398 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
399 | } | |
400 | static DEVICE_ATTR_RO(in_read_index); | |
401 | ||
402 | static ssize_t in_write_index_show(struct device *dev, | |
403 | struct device_attribute *dev_attr, char *buf) | |
404 | { | |
405 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
406 | struct hv_ring_buffer_debug_info inbound; | |
407 | ||
408 | if (!hv_dev->channel) | |
409 | return -ENODEV; | |
410 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
411 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
412 | } | |
413 | static DEVICE_ATTR_RO(in_write_index); | |
414 | ||
415 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
416 | struct device_attribute *dev_attr, | |
417 | char *buf) | |
418 | { | |
419 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
420 | struct hv_ring_buffer_debug_info inbound; | |
421 | ||
422 | if (!hv_dev->channel) | |
423 | return -ENODEV; | |
424 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
425 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
426 | } | |
427 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
428 | ||
429 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
430 | struct device_attribute *dev_attr, | |
431 | char *buf) | |
432 | { | |
433 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
434 | struct hv_ring_buffer_debug_info inbound; | |
435 | ||
436 | if (!hv_dev->channel) | |
437 | return -ENODEV; | |
438 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
439 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
440 | } | |
441 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
442 | ||
042ab031 DC |
443 | static ssize_t channel_vp_mapping_show(struct device *dev, |
444 | struct device_attribute *dev_attr, | |
445 | char *buf) | |
446 | { | |
447 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
448 | struct vmbus_channel *channel = hv_dev->channel, *cur_sc; | |
449 | unsigned long flags; | |
450 | int buf_size = PAGE_SIZE, n_written, tot_written; | |
451 | struct list_head *cur; | |
452 | ||
453 | if (!channel) | |
454 | return -ENODEV; | |
455 | ||
456 | tot_written = snprintf(buf, buf_size, "%u:%u\n", | |
457 | channel->offermsg.child_relid, channel->target_cpu); | |
458 | ||
459 | spin_lock_irqsave(&channel->lock, flags); | |
460 | ||
461 | list_for_each(cur, &channel->sc_list) { | |
462 | if (tot_written >= buf_size - 1) | |
463 | break; | |
464 | ||
465 | cur_sc = list_entry(cur, struct vmbus_channel, sc_list); | |
466 | n_written = scnprintf(buf + tot_written, | |
467 | buf_size - tot_written, | |
468 | "%u:%u\n", | |
469 | cur_sc->offermsg.child_relid, | |
470 | cur_sc->target_cpu); | |
471 | tot_written += n_written; | |
472 | } | |
473 | ||
474 | spin_unlock_irqrestore(&channel->lock, flags); | |
475 | ||
476 | return tot_written; | |
477 | } | |
478 | static DEVICE_ATTR_RO(channel_vp_mapping); | |
479 | ||
7047f17d S |
480 | static ssize_t vendor_show(struct device *dev, |
481 | struct device_attribute *dev_attr, | |
482 | char *buf) | |
483 | { | |
484 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
485 | return sprintf(buf, "0x%x\n", hv_dev->vendor_id); | |
486 | } | |
487 | static DEVICE_ATTR_RO(vendor); | |
488 | ||
489 | static ssize_t device_show(struct device *dev, | |
490 | struct device_attribute *dev_attr, | |
491 | char *buf) | |
492 | { | |
493 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
494 | return sprintf(buf, "0x%x\n", hv_dev->device_id); | |
495 | } | |
496 | static DEVICE_ATTR_RO(device); | |
497 | ||
98f4c651 | 498 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
03f3a910 GKH |
499 | static struct attribute *vmbus_attrs[] = { |
500 | &dev_attr_id.attr, | |
a8fb5f3d | 501 | &dev_attr_state.attr, |
5ffd00e2 | 502 | &dev_attr_monitor_id.attr, |
68234c04 | 503 | &dev_attr_class_id.attr, |
7c55e1d0 | 504 | &dev_attr_device_id.attr, |
647fa371 | 505 | &dev_attr_modalias.attr, |
76c52bbe GKH |
506 | &dev_attr_server_monitor_pending.attr, |
507 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
508 | &dev_attr_server_monitor_latency.attr, |
509 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
510 | &dev_attr_server_monitor_conn_id.attr, |
511 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
512 | &dev_attr_out_intr_mask.attr, |
513 | &dev_attr_out_read_index.attr, | |
514 | &dev_attr_out_write_index.attr, | |
515 | &dev_attr_out_read_bytes_avail.attr, | |
516 | &dev_attr_out_write_bytes_avail.attr, | |
517 | &dev_attr_in_intr_mask.attr, | |
518 | &dev_attr_in_read_index.attr, | |
519 | &dev_attr_in_write_index.attr, | |
520 | &dev_attr_in_read_bytes_avail.attr, | |
521 | &dev_attr_in_write_bytes_avail.attr, | |
042ab031 | 522 | &dev_attr_channel_vp_mapping.attr, |
7047f17d S |
523 | &dev_attr_vendor.attr, |
524 | &dev_attr_device.attr, | |
03f3a910 GKH |
525 | NULL, |
526 | }; | |
527 | ATTRIBUTE_GROUPS(vmbus); | |
528 | ||
adde2487 S |
529 | /* |
530 | * vmbus_uevent - add uevent for our device | |
531 | * | |
532 | * This routine is invoked when a device is added or removed on the vmbus to | |
533 | * generate a uevent to udev in the userspace. The udev will then look at its | |
534 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
535 | * |
536 | * The alias string will be of the form vmbus:guid where guid is the string | |
537 | * representation of the device guid (each byte of the guid will be | |
538 | * represented with two hex characters. | |
adde2487 S |
539 | */ |
540 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
541 | { | |
542 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
543 | int ret; |
544 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 545 | |
fd776ba9 | 546 | print_alias_name(dev, alias_name); |
0ddda660 S |
547 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
548 | return ret; | |
adde2487 S |
549 | } |
550 | ||
1b9d48f2 | 551 | static const uuid_le null_guid; |
5841a829 | 552 | |
af3ff643 | 553 | static inline bool is_null_guid(const uuid_le *guid) |
5841a829 | 554 | { |
4ae92508 | 555 | if (uuid_le_cmp(*guid, null_guid)) |
5841a829 S |
556 | return false; |
557 | return true; | |
558 | } | |
559 | ||
3037a7b6 S |
560 | /* |
561 | * Return a matching hv_vmbus_device_id pointer. | |
562 | * If there is no match, return NULL. | |
563 | */ | |
564 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
565 | const struct hv_vmbus_device_id *id, | |
af3ff643 | 566 | const uuid_le *guid) |
3037a7b6 | 567 | { |
af3ff643 | 568 | for (; !is_null_guid(&id->guid); id++) |
4ae92508 | 569 | if (!uuid_le_cmp(id->guid, *guid)) |
3037a7b6 S |
570 | return id; |
571 | ||
572 | return NULL; | |
573 | } | |
574 | ||
575 | ||
b7fc147b S |
576 | |
577 | /* | |
578 | * vmbus_match - Attempt to match the specified device to the specified driver | |
579 | */ | |
580 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
581 | { | |
b7fc147b | 582 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 583 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 584 | |
8981da32 DC |
585 | /* The hv_sock driver handles all hv_sock offers. */ |
586 | if (is_hvsock_channel(hv_dev->channel)) | |
587 | return drv->hvsock; | |
588 | ||
af3ff643 | 589 | if (hv_vmbus_get_id(drv->id_table, &hv_dev->dev_type)) |
3037a7b6 | 590 | return 1; |
de632a2b | 591 | |
5841a829 | 592 | return 0; |
b7fc147b S |
593 | } |
594 | ||
f1f0d67b S |
595 | /* |
596 | * vmbus_probe - Add the new vmbus's child device | |
597 | */ | |
598 | static int vmbus_probe(struct device *child_device) | |
599 | { | |
600 | int ret = 0; | |
601 | struct hv_driver *drv = | |
602 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 603 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 604 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 605 | |
af3ff643 | 606 | dev_id = hv_vmbus_get_id(drv->id_table, &dev->dev_type); |
9efd21e1 | 607 | if (drv->probe) { |
84946899 | 608 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 609 | if (ret != 0) |
0a46618d HJ |
610 | pr_err("probe failed for device %s (%d)\n", |
611 | dev_name(child_device), ret); | |
f1f0d67b | 612 | |
f1f0d67b | 613 | } else { |
0a46618d HJ |
614 | pr_err("probe not set for driver %s\n", |
615 | dev_name(child_device)); | |
6de925b1 | 616 | ret = -ENODEV; |
f1f0d67b S |
617 | } |
618 | return ret; | |
619 | } | |
620 | ||
c5dce3db S |
621 | /* |
622 | * vmbus_remove - Remove a vmbus device | |
623 | */ | |
624 | static int vmbus_remove(struct device *child_device) | |
625 | { | |
d15a0301 | 626 | struct hv_driver *drv; |
415b023a | 627 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 628 | |
d15a0301 S |
629 | if (child_device->driver) { |
630 | drv = drv_to_hv_drv(child_device->driver); | |
631 | if (drv->remove) | |
632 | drv->remove(dev); | |
d15a0301 | 633 | } |
c5dce3db S |
634 | |
635 | return 0; | |
636 | } | |
637 | ||
eb1bb259 S |
638 | |
639 | /* | |
640 | * vmbus_shutdown - Shutdown a vmbus device | |
641 | */ | |
642 | static void vmbus_shutdown(struct device *child_device) | |
643 | { | |
644 | struct hv_driver *drv; | |
ca6887fb | 645 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
646 | |
647 | ||
648 | /* The device may not be attached yet */ | |
649 | if (!child_device->driver) | |
650 | return; | |
651 | ||
652 | drv = drv_to_hv_drv(child_device->driver); | |
653 | ||
ca6887fb S |
654 | if (drv->shutdown) |
655 | drv->shutdown(dev); | |
eb1bb259 S |
656 | |
657 | return; | |
658 | } | |
659 | ||
086e7a56 S |
660 | |
661 | /* | |
662 | * vmbus_device_release - Final callback release of the vmbus child device | |
663 | */ | |
664 | static void vmbus_device_release(struct device *device) | |
665 | { | |
e8e27047 | 666 | struct hv_device *hv_dev = device_to_hv_device(device); |
34c6801e | 667 | struct vmbus_channel *channel = hv_dev->channel; |
086e7a56 | 668 | |
34c6801e DC |
669 | hv_process_channel_removal(channel, |
670 | channel->offermsg.child_relid); | |
e8e27047 | 671 | kfree(hv_dev); |
086e7a56 S |
672 | |
673 | } | |
674 | ||
454f18a9 | 675 | /* The one and only one */ |
9adcac5c S |
676 | static struct bus_type hv_bus = { |
677 | .name = "vmbus", | |
678 | .match = vmbus_match, | |
679 | .shutdown = vmbus_shutdown, | |
680 | .remove = vmbus_remove, | |
681 | .probe = vmbus_probe, | |
682 | .uevent = vmbus_uevent, | |
03f3a910 | 683 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
684 | }; |
685 | ||
bf6506f6 TT |
686 | struct onmessage_work_context { |
687 | struct work_struct work; | |
688 | struct hv_message msg; | |
689 | }; | |
690 | ||
691 | static void vmbus_onmessage_work(struct work_struct *work) | |
692 | { | |
693 | struct onmessage_work_context *ctx; | |
694 | ||
09a19628 VK |
695 | /* Do not process messages if we're in DISCONNECTED state */ |
696 | if (vmbus_connection.conn_state == DISCONNECTED) | |
697 | return; | |
698 | ||
bf6506f6 TT |
699 | ctx = container_of(work, struct onmessage_work_context, |
700 | work); | |
701 | vmbus_onmessage(&ctx->msg); | |
702 | kfree(ctx); | |
703 | } | |
704 | ||
d8a60e00 | 705 | static void hv_process_timer_expiration(struct hv_message *msg, int cpu) |
4061ed9e S |
706 | { |
707 | struct clock_event_device *dev = hv_context.clk_evt[cpu]; | |
708 | ||
709 | if (dev->event_handler) | |
710 | dev->event_handler(dev); | |
711 | ||
712 | msg->header.message_type = HVMSG_NONE; | |
713 | ||
714 | /* | |
715 | * Make sure the write to MessageType (ie set to | |
716 | * HVMSG_NONE) happens before we read the | |
717 | * MessagePending and EOMing. Otherwise, the EOMing | |
718 | * will not deliver any more messages since there is | |
719 | * no empty slot | |
720 | */ | |
721 | mb(); | |
722 | ||
723 | if (msg->header.message_flags.msg_pending) { | |
724 | /* | |
725 | * This will cause message queue rescan to | |
726 | * possibly deliver another msg from the | |
727 | * hypervisor | |
728 | */ | |
729 | wrmsrl(HV_X64_MSR_EOM, 0); | |
730 | } | |
731 | } | |
732 | ||
62c1059d | 733 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
734 | { |
735 | int cpu = smp_processor_id(); | |
736 | void *page_addr = hv_context.synic_message_page[cpu]; | |
737 | struct hv_message *msg = (struct hv_message *)page_addr + | |
738 | VMBUS_MESSAGE_SINT; | |
652594c7 DC |
739 | struct vmbus_channel_message_header *hdr; |
740 | struct vmbus_channel_message_table_entry *entry; | |
bf6506f6 | 741 | struct onmessage_work_context *ctx; |
36199a99 | 742 | |
7be3e169 VK |
743 | if (msg->header.message_type == HVMSG_NONE) |
744 | /* no msg */ | |
745 | return; | |
652594c7 | 746 | |
7be3e169 | 747 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
652594c7 | 748 | |
7be3e169 VK |
749 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
750 | WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype); | |
751 | goto msg_handled; | |
752 | } | |
652594c7 | 753 | |
7be3e169 VK |
754 | entry = &channel_message_table[hdr->msgtype]; |
755 | if (entry->handler_type == VMHT_BLOCKING) { | |
756 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); | |
757 | if (ctx == NULL) | |
758 | return; | |
652594c7 | 759 | |
7be3e169 VK |
760 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
761 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
652594c7 | 762 | |
7be3e169 VK |
763 | queue_work(vmbus_connection.work_queue, &ctx->work); |
764 | } else | |
765 | entry->message_handler(hdr); | |
36199a99 | 766 | |
652594c7 | 767 | msg_handled: |
7be3e169 VK |
768 | msg->header.message_type = HVMSG_NONE; |
769 | ||
770 | /* | |
771 | * Make sure the write to MessageType (ie set to | |
772 | * HVMSG_NONE) happens before we read the | |
773 | * MessagePending and EOMing. Otherwise, the EOMing | |
774 | * will not deliver any more messages since there is | |
775 | * no empty slot | |
776 | */ | |
777 | mb(); | |
36199a99 | 778 | |
7be3e169 | 779 | if (msg->header.message_flags.msg_pending) { |
36199a99 | 780 | /* |
7be3e169 VK |
781 | * This will cause message queue rescan to |
782 | * possibly deliver another msg from the | |
783 | * hypervisor | |
36199a99 | 784 | */ |
7be3e169 | 785 | wrmsrl(HV_X64_MSR_EOM, 0); |
36199a99 GKH |
786 | } |
787 | } | |
788 | ||
76d388cd | 789 | static void vmbus_isr(void) |
36199a99 | 790 | { |
36199a99 GKH |
791 | int cpu = smp_processor_id(); |
792 | void *page_addr; | |
793 | struct hv_message *msg; | |
794 | union hv_synic_event_flags *event; | |
ae4636e6 | 795 | bool handled = false; |
36199a99 | 796 | |
5ab05951 S |
797 | page_addr = hv_context.synic_event_page[cpu]; |
798 | if (page_addr == NULL) | |
76d388cd | 799 | return; |
5ab05951 S |
800 | |
801 | event = (union hv_synic_event_flags *)page_addr + | |
802 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
803 | /* |
804 | * Check for events before checking for messages. This is the order | |
805 | * in which events and messages are checked in Windows guests on | |
806 | * Hyper-V, and the Windows team suggested we do the same. | |
807 | */ | |
36199a99 | 808 | |
6552ecd7 S |
809 | if ((vmbus_proto_version == VERSION_WS2008) || |
810 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 811 | |
6552ecd7 S |
812 | /* Since we are a child, we only need to check bit 0 */ |
813 | if (sync_test_and_clear_bit(0, | |
814 | (unsigned long *) &event->flags32[0])) { | |
815 | handled = true; | |
816 | } | |
817 | } else { | |
818 | /* | |
819 | * Our host is win8 or above. The signaling mechanism | |
820 | * has changed and we can directly look at the event page. | |
821 | * If bit n is set then we have an interrup on the channel | |
822 | * whose id is n. | |
823 | */ | |
ae4636e6 | 824 | handled = true; |
ae4636e6 | 825 | } |
793be9c7 | 826 | |
6552ecd7 | 827 | if (handled) |
db11f12a | 828 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
829 | |
830 | ||
7341d908 S |
831 | page_addr = hv_context.synic_message_page[cpu]; |
832 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
833 | ||
834 | /* Check if there are actual msgs to be processed */ | |
4061ed9e S |
835 | if (msg->header.message_type != HVMSG_NONE) { |
836 | if (msg->header.message_type == HVMSG_TIMER_EXPIRED) | |
837 | hv_process_timer_expiration(msg, cpu); | |
838 | else | |
839 | tasklet_schedule(&msg_dpc); | |
840 | } | |
793be9c7 S |
841 | } |
842 | ||
e513229b | 843 | |
3e189519 | 844 | /* |
90c9960e GKH |
845 | * vmbus_bus_init -Main vmbus driver initialization routine. |
846 | * | |
847 | * Here, we | |
0686e4f4 | 848 | * - initialize the vmbus driver context |
0686e4f4 | 849 | * - invoke the vmbus hv main init routine |
0686e4f4 | 850 | * - retrieve the channel offers |
90c9960e | 851 | */ |
efc26722 | 852 | static int vmbus_bus_init(void) |
3e7ee490 | 853 | { |
90c9960e | 854 | int ret; |
3e7ee490 | 855 | |
6d26e38f GKH |
856 | /* Hypervisor initialization...setup hypercall page..etc */ |
857 | ret = hv_init(); | |
90c9960e | 858 | if (ret != 0) { |
0a46618d | 859 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 860 | return ret; |
3e7ee490 HJ |
861 | } |
862 | ||
59c0e4f0 | 863 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 864 | |
9adcac5c | 865 | ret = bus_register(&hv_bus); |
d6c1c5de | 866 | if (ret) |
8b9987e9 | 867 | goto err_cleanup; |
3e7ee490 | 868 | |
76d388cd | 869 | hv_setup_vmbus_irq(vmbus_isr); |
3e7ee490 | 870 | |
2608fb65 JW |
871 | ret = hv_synic_alloc(); |
872 | if (ret) | |
873 | goto err_alloc; | |
800b6902 | 874 | /* |
302a3c0f | 875 | * Initialize the per-cpu interrupt state and |
800b6902 S |
876 | * connect to the host. |
877 | */ | |
302a3c0f | 878 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 879 | ret = vmbus_connect(); |
8b9987e9 | 880 | if (ret) |
17efbee8 | 881 | goto err_connect; |
800b6902 | 882 | |
f39c4280 VK |
883 | if (vmbus_proto_version > VERSION_WIN7) |
884 | cpu_hotplug_disable(); | |
96c1d058 NM |
885 | |
886 | /* | |
887 | * Only register if the crash MSRs are available | |
888 | */ | |
cc2dd402 | 889 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
510f7aef | 890 | register_die_notifier(&hyperv_die_block); |
96c1d058 NM |
891 | atomic_notifier_chain_register(&panic_notifier_list, |
892 | &hyperv_panic_block); | |
893 | } | |
894 | ||
2d6e882b | 895 | vmbus_request_offers(); |
8b5d6d3b | 896 | |
d6c1c5de | 897 | return 0; |
8b9987e9 | 898 | |
17efbee8 AS |
899 | err_connect: |
900 | on_each_cpu(hv_synic_cleanup, NULL, 1); | |
2608fb65 JW |
901 | err_alloc: |
902 | hv_synic_free(); | |
76d388cd | 903 | hv_remove_vmbus_irq(); |
8b9987e9 | 904 | |
8b9987e9 S |
905 | bus_unregister(&hv_bus); |
906 | ||
907 | err_cleanup: | |
908 | hv_cleanup(); | |
909 | ||
910 | return ret; | |
3e7ee490 HJ |
911 | } |
912 | ||
90c9960e | 913 | /** |
35464483 JO |
914 | * __vmbus_child_driver_register() - Register a vmbus's driver |
915 | * @hv_driver: Pointer to driver structure you want to register | |
768fa219 GKH |
916 | * @owner: owner module of the drv |
917 | * @mod_name: module name string | |
3e189519 HJ |
918 | * |
919 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 920 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
921 | * It will return the state of the 'driver_register()' call. |
922 | * | |
90c9960e | 923 | */ |
768fa219 | 924 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 925 | { |
5d48a1c2 | 926 | int ret; |
3e7ee490 | 927 | |
768fa219 | 928 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 929 | |
cf6a2eac S |
930 | ret = vmbus_exists(); |
931 | if (ret < 0) | |
932 | return ret; | |
933 | ||
768fa219 GKH |
934 | hv_driver->driver.name = hv_driver->name; |
935 | hv_driver->driver.owner = owner; | |
936 | hv_driver->driver.mod_name = mod_name; | |
937 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 938 | |
768fa219 | 939 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 940 | |
5d48a1c2 | 941 | return ret; |
3e7ee490 | 942 | } |
768fa219 | 943 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 944 | |
90c9960e | 945 | /** |
768fa219 | 946 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
35464483 JO |
947 | * @hv_driver: Pointer to driver structure you want to |
948 | * un-register | |
3e189519 | 949 | * |
768fa219 GKH |
950 | * Un-register the given driver that was previous registered with a call to |
951 | * vmbus_driver_register() | |
90c9960e | 952 | */ |
768fa219 | 953 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 954 | { |
768fa219 | 955 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 956 | |
cf6a2eac | 957 | if (!vmbus_exists()) |
8f257a14 | 958 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 959 | } |
768fa219 | 960 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 961 | |
3e189519 | 962 | /* |
f2c73011 | 963 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 964 | * on the vmbus. |
90c9960e | 965 | */ |
1b9d48f2 | 966 | struct hv_device *vmbus_device_create(const uuid_le *type, |
967 | const uuid_le *instance, | |
968 | struct vmbus_channel *channel) | |
3e7ee490 | 969 | { |
3d3b5518 | 970 | struct hv_device *child_device_obj; |
3e7ee490 | 971 | |
6bad88da S |
972 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
973 | if (!child_device_obj) { | |
0a46618d | 974 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
975 | return NULL; |
976 | } | |
977 | ||
cae5b843 | 978 | child_device_obj->channel = channel; |
358d2ee2 | 979 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 980 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 981 | sizeof(uuid_le)); |
7047f17d | 982 | child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */ |
3e7ee490 | 983 | |
3e7ee490 | 984 | |
3e7ee490 HJ |
985 | return child_device_obj; |
986 | } | |
987 | ||
3e189519 | 988 | /* |
22794281 | 989 | * vmbus_device_register - Register the child device |
90c9960e | 990 | */ |
22794281 | 991 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 992 | { |
90c9960e | 993 | int ret = 0; |
6bad88da | 994 | |
bc63b6f6 VK |
995 | dev_set_name(&child_device_obj->device, "vmbus_%d", |
996 | child_device_obj->channel->id); | |
3e7ee490 | 997 | |
0bce28b6 | 998 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 999 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 1000 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 1001 | |
90c9960e GKH |
1002 | /* |
1003 | * Register with the LDM. This will kick off the driver/device | |
1004 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
1005 | */ | |
6bad88da | 1006 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 1007 | |
3e7ee490 | 1008 | if (ret) |
0a46618d | 1009 | pr_err("Unable to register child device\n"); |
3e7ee490 | 1010 | else |
84672369 | 1011 | pr_debug("child device %s registered\n", |
0a46618d | 1012 | dev_name(&child_device_obj->device)); |
3e7ee490 | 1013 | |
3e7ee490 HJ |
1014 | return ret; |
1015 | } | |
1016 | ||
3e189519 | 1017 | /* |
696453ba | 1018 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 1019 | * from the vmbus. |
90c9960e | 1020 | */ |
696453ba | 1021 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 1022 | { |
84672369 FS |
1023 | pr_debug("child device %s unregistered\n", |
1024 | dev_name(&device_obj->device)); | |
1025 | ||
90c9960e GKH |
1026 | /* |
1027 | * Kick off the process of unregistering the device. | |
1028 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
1029 | */ | |
6bad88da | 1030 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
1031 | } |
1032 | ||
3e7ee490 | 1033 | |
b0069f43 | 1034 | /* |
7f163a6f | 1035 | * VMBUS is an acpi enumerated device. Get the information we |
90f34535 | 1036 | * need from DSDT. |
b0069f43 | 1037 | */ |
7f163a6f | 1038 | #define VTPM_BASE_ADDRESS 0xfed40000 |
90f34535 | 1039 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 1040 | { |
7f163a6f JO |
1041 | resource_size_t start = 0; |
1042 | resource_size_t end = 0; | |
1043 | struct resource *new_res; | |
1044 | struct resource **old_res = &hyperv_mmio; | |
1045 | struct resource **prev_res = NULL; | |
1046 | ||
90f34535 | 1047 | switch (res->type) { |
7f163a6f JO |
1048 | |
1049 | /* | |
1050 | * "Address" descriptors are for bus windows. Ignore | |
1051 | * "memory" descriptors, which are for registers on | |
1052 | * devices. | |
1053 | */ | |
1054 | case ACPI_RESOURCE_TYPE_ADDRESS32: | |
1055 | start = res->data.address32.address.minimum; | |
1056 | end = res->data.address32.address.maximum; | |
4eb923f8 | 1057 | break; |
b0069f43 | 1058 | |
90f34535 | 1059 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
7f163a6f JO |
1060 | start = res->data.address64.address.minimum; |
1061 | end = res->data.address64.address.maximum; | |
4eb923f8 | 1062 | break; |
7f163a6f JO |
1063 | |
1064 | default: | |
1065 | /* Unused resource type */ | |
1066 | return AE_OK; | |
1067 | ||
b0069f43 | 1068 | } |
7f163a6f JO |
1069 | /* |
1070 | * Ignore ranges that are below 1MB, as they're not | |
1071 | * necessary or useful here. | |
1072 | */ | |
1073 | if (end < 0x100000) | |
1074 | return AE_OK; | |
1075 | ||
1076 | new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC); | |
1077 | if (!new_res) | |
1078 | return AE_NO_MEMORY; | |
1079 | ||
1080 | /* If this range overlaps the virtual TPM, truncate it. */ | |
1081 | if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS) | |
1082 | end = VTPM_BASE_ADDRESS; | |
1083 | ||
1084 | new_res->name = "hyperv mmio"; | |
1085 | new_res->flags = IORESOURCE_MEM; | |
1086 | new_res->start = start; | |
1087 | new_res->end = end; | |
1088 | ||
40f26f31 JO |
1089 | /* |
1090 | * Stick ranges from higher in address space at the front of the list. | |
1091 | * If two ranges are adjacent, merge them. | |
1092 | */ | |
7f163a6f JO |
1093 | do { |
1094 | if (!*old_res) { | |
1095 | *old_res = new_res; | |
1096 | break; | |
1097 | } | |
1098 | ||
40f26f31 JO |
1099 | if (((*old_res)->end + 1) == new_res->start) { |
1100 | (*old_res)->end = new_res->end; | |
1101 | kfree(new_res); | |
1102 | break; | |
1103 | } | |
1104 | ||
1105 | if ((*old_res)->start == new_res->end + 1) { | |
1106 | (*old_res)->start = new_res->start; | |
1107 | kfree(new_res); | |
1108 | break; | |
1109 | } | |
1110 | ||
7f163a6f JO |
1111 | if ((*old_res)->end < new_res->start) { |
1112 | new_res->sibling = *old_res; | |
1113 | if (prev_res) | |
1114 | (*prev_res)->sibling = new_res; | |
1115 | *old_res = new_res; | |
1116 | break; | |
1117 | } | |
1118 | ||
1119 | prev_res = old_res; | |
1120 | old_res = &(*old_res)->sibling; | |
1121 | ||
1122 | } while (1); | |
b0069f43 S |
1123 | |
1124 | return AE_OK; | |
1125 | } | |
1126 | ||
7f163a6f JO |
1127 | static int vmbus_acpi_remove(struct acpi_device *device) |
1128 | { | |
1129 | struct resource *cur_res; | |
1130 | struct resource *next_res; | |
1131 | ||
1132 | if (hyperv_mmio) { | |
1133 | for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) { | |
1134 | next_res = cur_res->sibling; | |
1135 | kfree(cur_res); | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
35464483 JO |
1142 | /** |
1143 | * vmbus_allocate_mmio() - Pick a memory-mapped I/O range. | |
1144 | * @new: If successful, supplied a pointer to the | |
1145 | * allocated MMIO space. | |
1146 | * @device_obj: Identifies the caller | |
1147 | * @min: Minimum guest physical address of the | |
1148 | * allocation | |
1149 | * @max: Maximum guest physical address | |
1150 | * @size: Size of the range to be allocated | |
1151 | * @align: Alignment of the range to be allocated | |
1152 | * @fb_overlap_ok: Whether this allocation can be allowed | |
1153 | * to overlap the video frame buffer. | |
1154 | * | |
1155 | * This function walks the resources granted to VMBus by the | |
1156 | * _CRS object in the ACPI namespace underneath the parent | |
1157 | * "bridge" whether that's a root PCI bus in the Generation 1 | |
1158 | * case or a Module Device in the Generation 2 case. It then | |
1159 | * attempts to allocate from the global MMIO pool in a way that | |
1160 | * matches the constraints supplied in these parameters and by | |
1161 | * that _CRS. | |
1162 | * | |
1163 | * Return: 0 on success, -errno on failure | |
1164 | */ | |
1165 | int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, | |
1166 | resource_size_t min, resource_size_t max, | |
1167 | resource_size_t size, resource_size_t align, | |
1168 | bool fb_overlap_ok) | |
1169 | { | |
1170 | struct resource *iter; | |
1171 | resource_size_t range_min, range_max, start, local_min, local_max; | |
1172 | const char *dev_n = dev_name(&device_obj->device); | |
1173 | u32 fb_end = screen_info.lfb_base + (screen_info.lfb_size << 1); | |
1174 | int i; | |
1175 | ||
1176 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { | |
1177 | if ((iter->start >= max) || (iter->end <= min)) | |
1178 | continue; | |
1179 | ||
1180 | range_min = iter->start; | |
1181 | range_max = iter->end; | |
1182 | ||
1183 | /* If this range overlaps the frame buffer, split it into | |
1184 | two tries. */ | |
1185 | for (i = 0; i < 2; i++) { | |
1186 | local_min = range_min; | |
1187 | local_max = range_max; | |
1188 | if (fb_overlap_ok || (range_min >= fb_end) || | |
1189 | (range_max <= screen_info.lfb_base)) { | |
1190 | i++; | |
1191 | } else { | |
1192 | if ((range_min <= screen_info.lfb_base) && | |
1193 | (range_max >= screen_info.lfb_base)) { | |
1194 | /* | |
1195 | * The frame buffer is in this window, | |
1196 | * so trim this into the part that | |
1197 | * preceeds the frame buffer. | |
1198 | */ | |
1199 | local_max = screen_info.lfb_base - 1; | |
1200 | range_min = fb_end; | |
1201 | } else { | |
1202 | range_min = fb_end; | |
1203 | continue; | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | start = (local_min + align - 1) & ~(align - 1); | |
1208 | for (; start + size - 1 <= local_max; start += align) { | |
1209 | *new = request_mem_region_exclusive(start, size, | |
1210 | dev_n); | |
1211 | if (*new) | |
1212 | return 0; | |
1213 | } | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | return -ENXIO; | |
1218 | } | |
1219 | EXPORT_SYMBOL_GPL(vmbus_allocate_mmio); | |
1220 | ||
619848bd JO |
1221 | /** |
1222 | * vmbus_cpu_number_to_vp_number() - Map CPU to VP. | |
1223 | * @cpu_number: CPU number in Linux terms | |
1224 | * | |
1225 | * This function returns the mapping between the Linux processor | |
1226 | * number and the hypervisor's virtual processor number, useful | |
1227 | * in making hypercalls and such that talk about specific | |
1228 | * processors. | |
1229 | * | |
1230 | * Return: Virtual processor number in Hyper-V terms | |
1231 | */ | |
1232 | int vmbus_cpu_number_to_vp_number(int cpu_number) | |
1233 | { | |
1234 | return hv_context.vp_index[cpu_number]; | |
1235 | } | |
1236 | EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number); | |
1237 | ||
b0069f43 S |
1238 | static int vmbus_acpi_add(struct acpi_device *device) |
1239 | { | |
1240 | acpi_status result; | |
90f34535 | 1241 | int ret_val = -ENODEV; |
7f163a6f | 1242 | struct acpi_device *ancestor; |
b0069f43 | 1243 | |
607c1a11 S |
1244 | hv_acpi_dev = device; |
1245 | ||
0a4425b6 | 1246 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 1247 | vmbus_walk_resources, NULL); |
b0069f43 | 1248 | |
90f34535 S |
1249 | if (ACPI_FAILURE(result)) |
1250 | goto acpi_walk_err; | |
1251 | /* | |
7f163a6f JO |
1252 | * Some ancestor of the vmbus acpi device (Gen1 or Gen2 |
1253 | * firmware) is the VMOD that has the mmio ranges. Get that. | |
90f34535 | 1254 | */ |
7f163a6f JO |
1255 | for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) { |
1256 | result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS, | |
1257 | vmbus_walk_resources, NULL); | |
90f34535 S |
1258 | |
1259 | if (ACPI_FAILURE(result)) | |
7f163a6f JO |
1260 | continue; |
1261 | if (hyperv_mmio) | |
1262 | break; | |
b0069f43 | 1263 | } |
90f34535 S |
1264 | ret_val = 0; |
1265 | ||
1266 | acpi_walk_err: | |
b0069f43 | 1267 | complete(&probe_event); |
7f163a6f JO |
1268 | if (ret_val) |
1269 | vmbus_acpi_remove(device); | |
90f34535 | 1270 | return ret_val; |
b0069f43 S |
1271 | } |
1272 | ||
1273 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
1274 | {"VMBUS", 0}, | |
9d7b18d1 | 1275 | {"VMBus", 0}, |
b0069f43 S |
1276 | {"", 0}, |
1277 | }; | |
1278 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
1279 | ||
1280 | static struct acpi_driver vmbus_acpi_driver = { | |
1281 | .name = "vmbus", | |
1282 | .ids = vmbus_acpi_device_ids, | |
1283 | .ops = { | |
1284 | .add = vmbus_acpi_add, | |
e4ecb41c | 1285 | .remove = vmbus_acpi_remove, |
b0069f43 S |
1286 | }, |
1287 | }; | |
1288 | ||
2517281d VK |
1289 | static void hv_kexec_handler(void) |
1290 | { | |
1291 | int cpu; | |
1292 | ||
1293 | hv_synic_clockevents_cleanup(); | |
1294 | vmbus_initiate_unload(); | |
1295 | for_each_online_cpu(cpu) | |
1296 | smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1); | |
1297 | hv_cleanup(); | |
1298 | }; | |
1299 | ||
b4370df2 VK |
1300 | static void hv_crash_handler(struct pt_regs *regs) |
1301 | { | |
1302 | vmbus_initiate_unload(); | |
1303 | /* | |
1304 | * In crash handler we can't schedule synic cleanup for all CPUs, | |
1305 | * doing the cleanup for current CPU only. This should be sufficient | |
1306 | * for kdump. | |
1307 | */ | |
1308 | hv_synic_cleanup(NULL); | |
1309 | hv_cleanup(); | |
1310 | }; | |
1311 | ||
607c1a11 | 1312 | static int __init hv_acpi_init(void) |
1168ac22 | 1313 | { |
2dda95f8 | 1314 | int ret, t; |
b0069f43 | 1315 | |
1f94ea81 | 1316 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
1317 | return -ENODEV; |
1318 | ||
b0069f43 S |
1319 | init_completion(&probe_event); |
1320 | ||
1321 | /* | |
efc26722 | 1322 | * Get ACPI resources first. |
b0069f43 | 1323 | */ |
0246604c S |
1324 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
1325 | ||
b0069f43 S |
1326 | if (ret) |
1327 | return ret; | |
1328 | ||
2dda95f8 S |
1329 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
1330 | if (t == 0) { | |
1331 | ret = -ETIMEDOUT; | |
1332 | goto cleanup; | |
1333 | } | |
b0069f43 | 1334 | |
efc26722 | 1335 | ret = vmbus_bus_init(); |
91fd799e | 1336 | if (ret) |
2dda95f8 S |
1337 | goto cleanup; |
1338 | ||
2517281d | 1339 | hv_setup_kexec_handler(hv_kexec_handler); |
b4370df2 | 1340 | hv_setup_crash_handler(hv_crash_handler); |
2517281d | 1341 | |
2dda95f8 S |
1342 | return 0; |
1343 | ||
1344 | cleanup: | |
1345 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 1346 | hv_acpi_dev = NULL; |
91fd799e | 1347 | return ret; |
1168ac22 S |
1348 | } |
1349 | ||
93e5bd06 S |
1350 | static void __exit vmbus_exit(void) |
1351 | { | |
e72e7ac5 VK |
1352 | int cpu; |
1353 | ||
2517281d | 1354 | hv_remove_kexec_handler(); |
b4370df2 | 1355 | hv_remove_crash_handler(); |
09a19628 | 1356 | vmbus_connection.conn_state = DISCONNECTED; |
e086748c | 1357 | hv_synic_clockevents_cleanup(); |
2db84eff | 1358 | vmbus_disconnect(); |
76d388cd | 1359 | hv_remove_vmbus_irq(); |
1959a28e | 1360 | tasklet_kill(&msg_dpc); |
93e5bd06 | 1361 | vmbus_free_channels(); |
cc2dd402 | 1362 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
510f7aef | 1363 | unregister_die_notifier(&hyperv_die_block); |
096c605f VK |
1364 | atomic_notifier_chain_unregister(&panic_notifier_list, |
1365 | &hyperv_panic_block); | |
1366 | } | |
93e5bd06 S |
1367 | bus_unregister(&hv_bus); |
1368 | hv_cleanup(); | |
1959a28e VK |
1369 | for_each_online_cpu(cpu) { |
1370 | tasklet_kill(hv_context.event_dpc[cpu]); | |
e72e7ac5 | 1371 | smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1); |
1959a28e | 1372 | } |
06210b42 | 1373 | hv_synic_free(); |
93e5bd06 | 1374 | acpi_bus_unregister_driver(&vmbus_acpi_driver); |
f39c4280 VK |
1375 | if (vmbus_proto_version > VERSION_WIN7) |
1376 | cpu_hotplug_enable(); | |
93e5bd06 S |
1377 | } |
1378 | ||
1168ac22 | 1379 | |
90c9960e | 1380 | MODULE_LICENSE("GPL"); |
3e7ee490 | 1381 | |
43d4e119 | 1382 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 1383 | module_exit(vmbus_exit); |